urine as 2H-hippuric acid and 20 hours after the
exposure 1-8 (SD 0 3) mmol or 78% had been
excreted (fig 3). The cumulative excretion of both
labelled and unlabelled hippuric acid was 3-4 (SD
0-9) mmol already after four hours and thus exceeded
the uptake of toluene. After 20 hours the totally
excreted amount was 8-0 (SD 2-2) mmol hippuric
acid or almost four times higher than the uptake of
toluene.